I had recently reinstalled IIS and attempted to reinstall Plesk 7.5.4 over an old installation (7.5.3) in order to preserve email and domain setups. Email boxes and settings carried over and work fine.... but the domain stuff is still whacked.

Thanks for the suggestion... but the only way I was able to fix it was (sigh) a complete uninstall and reinstall... and when i say complete, I really mean complete, as in removing all content and leftover directories and files.